[Izkata]

Buried in the replies is this one: https://twitter.com/jmq_en/status/1255994757773324289

Which is basically my understanding of "too long" lines: The problem doesn't have to do with the length of the line itself / reading one line (which is what most people seem to focus on), it has to do with reliably returning to the beginning of the next line instead of accidentally drifting up or down.

So it wouldn't be much of a problem if there were other visual indicators (code lines have unique shapes instead of being a big block of text, and paragraphs with a blank line between them let you see more easily "I'm going from line 2 of 4 to line 3 of 4" so you don't actually have to track the line sideways. It's tracking the line back to its beginning in a big block of non-code text that's difficult.